734 



PROCEEDINGS OF THE ACADEMY OF 



[Dec. , 



I897i. Montgomery, T. H. Studies on the Elements of the Central Nervous 

 System of the Heterone martini. Journ. Morph. Vol. 13. 



1854. MuLLER, J. Ueber ver.^chiedene Formen von Seethieren. Arch. f. 



Anat., Physiol, u. wiss. Med. Jahrg. 21. 

 1788. MiJLLER, O. F. Zoologica Danica. Havnifc. 



1855. OUDEMAXS, A. C. The Circulatory and Nephridial Apparatus of the 



Nemertea. Quart. Journ. Micr. Sci. Vol. 25. 

 1900. FuxxETT, E. C. On a Collection of Nemerteans from Singapore. 



Quart. Journ. Micr. Sci. Vol. 44. 

 1901a. PUNNETT, R. C. Nemerteans. Fauna and Georj. of Maldive and 



Laccadive Archipelaf/oes. Vol. I, Pt. 1. 

 19016. PuNNETT, R. C. On Two New British Nemerteans. Quart. Jonr. 



Micr. Sci. Vol. 44. 

 1846, QuATREFAGES, A. de. Etudes sur les types inferlenrs de I'embran- 



chement des Anueles. Ann. des. Sci. JVat. (3) T. 6. 

 1900a. Thompson, C. B. Preliminary Description of Zygenpolia litoralis, 

 a new Genus and new Species of Heteronemertean. Zool. Am. 



Bd. 23, No. 610. 

 19006. Thompson, C. B. Carinoma tremaphoros, a new Mesonemerteaa 



Species. Zool. Am. Bd. 23, No. 631. 

 1893. Verrill, a. E. The Marine Nemerteans of New England and 



Adjacent Waters. Trans. Connecticut Acad. Vol. 8. 



1895. Verrill, A. E. Supplement to the Marine Nemerteans and Planar- 



ians of New England. Trans. Connecticut Acad. Vol. 9. 

 1863. Wagener, G. K. Ueber die MuskelfaserderEvertebraten. Arch.f. 

 Anat., Physiol, u. wiss. Med. Jahrg. 30. 



1896. Wheeler, W. M. The Sexual Phases of Myzostoma. Mitt, aus 



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 1900. Wilson, C. B. The Habits and Early Development of Cerebratulns 

 lacteus (Verrill). Quart. Jour. Micr. Sci. Vol. 43. 



EXPLANATION OF PLATES XL-XLIV. 



All figures, except fig. 63, refer to Zygeupolia. The outlines of all 

 figures, except figs. 1, 4, 5, 6, have been drawn with the camera lucida of 

 Zeiss. 



The following reference letters are used in the figures : 



A., anus. 



Abs.C, absorptive cell. 



b., swollen portion of testis duct. 



B.L,, basement layer. 



P.M., basement membrane. 



PI. 31.. muscle of blood vessels. 



P. W., body wall. 



b.k.., baoal knob. 



Pl.f. C, blood-forming cell. 



Pl.L., blood lacuna. 



C, caudicle. 



C. W., caudicle wall. 



C.L.N., caudicle nerve. 



Cn.T., connective tissue. 



Gn.T.N., count'ctive tissue nucleus. 



Cn.T.S., connective tissue sheath. 



Contr. , contracted area. 



Chr., chromatin. 



Gil., cilia. 



Ctl., cuticle. 



Cu.Gl.-i, red-staining cutis gland 

 cell — coarse type. 



Cu. Gl-iy, red-staining cutis gland 

 cell — fine type. 



Cu,. Gl.2, blue-staining cutis gland 

 cell. 



Gy., cytoplasm. 



C.-V., cerebral nerve. 



G. Org., cerebral organ. 



G. Org. v., cerebral organ blood ves- 

 sel. 



CM., circular muscle. 



C.M.p.s., circular muscle of probos- 

 cis sheath. 



Gil. C, ciliated canal. 



Cil.P., ciliated pit. 



D. Comni., dorsal commissure. 



D.L., dor.sal lobe. 



D.N., dorsal nerve. 



D.V., dorsal blood vessel. 



